We crossed the ice in this photo before climbing to the campsite in the lower right. Choosing a route across such complicated terrain can be tricky. An icefield is like an enormous river – where the 'glacier bed' (think river bed) is flat the glacier surface is flat and 'smooth'. Where the ice passes over sub-glacier hills, the ice surface is rough and 'crevassey' like a river's rapids. Along the edge of a glacier the glacier surface can be rough or smooth depending on both the underlying bedrock and the shape of containing valley. Photographer: Bill Eichenlaub